CN2809679Y

CN2809679Y - Digital micromirror - laser projector

Info

Publication number: CN2809679Y
Application number: CN 200420061881
Authority: CN
Inventors: 陈友余
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-11-02
Filing date: 2004-11-02
Publication date: 2006-08-23
Anticipated expiration: 2014-11-02

Abstract

A kind of digital micro-mirror-laser projection, form by basic elements of character such as projection light source, dmd chip, camera lens and image processing control circuits, and the semiconductor laser diode that its projection light source becomes with red, green, blue three colour cells replaces temperature height, low UHP light source of life-span, solve the bottleneck problem of light source of projector, cancel excessive chromatic color filter and the polariscope of optical loss, significantly reduce the loss and the structure thereof of light; But utilize the modulating characteristic of laser, realize the dual regulation of circuit and light path, making laser output entirely is that mean value swings up and down with the variation of image in the output of half light---when image when deceiving, laser is output as 0; When image was maximum brightness, laser was total power output, reduces laser output power, thermal value and complete machine power consumption significantly, prolongs lifetime of LD, strengthens the color saturation of image, realizes green, energy-conservation, volume miniaturization.

Description

Digital micro-mirror-laser projection

Affiliated technical field

The utility model relates to a kind of projector, especially digital micro-mirror-laser projection.

Background technology

It is the shadow casting technique of up-to-date emergence after the TFT-CLD crystal projection that digital light shows the DLP projection, and its acp chip is made by large scale integrated circuit DMD micro mirror chip.Its pixel gap is less than 0.001 millimeter, and liquid crystal TFT-LCD is 0.1 millimeter.Superfine greasy image quality, 200,000 hours----chip life-spans of long-life are that the life-span can reach 50 years to watch 10 hours every day! The performance that superelevation contrast, super brightness etc. are excellent has surpassed the crystal projection of existing market owning amount maximum.Aspect large screen display, DLP projector can realize easily that the above jumbotron of 50-200 inch shows, is that plasma PDP, any flat-panel monitors such as liquid crystal TFT-LCD, CRT can not reach.So to say that digital light shows the tool potentiality of DLP projection.

More than 130 ten thousand little eyeglasses are arranged on the integrated chip of DMD digital micro-mirror.The white light source of high brightness passes colored filter or polariscope, is mapped on the high refractive index dmd chip, projects the screen video picture by camera lens again after the reflection.

DLP projector is divided into two kinds of working methods: 1, one chip dmd chip.Because Texas Instruments's patent simple monopoly and the producting process difficulty of invention DMD are very high, adopt monolithic dmd chip and UHP lamp mostly, higher source luminance sees through three looks of a high speed rotating, and (R-is red, G-is green, B-is blue, as follows) color filter, be mapped on the little eyeglass more than 1,300,000 on the dmd chip, reflex to the screen video picture again.2, three-chip type dmd chip.R, G, three kinds of colours of B are independently finished separately by three dmd chips respectively, and a shared high brightness UHP lamp is as light source, the separation of coloured light is isolated three kinds of coloured light by two polaroids, projects pairing separately dmd chip, invests screen by the little eyeglass reflection on each chip again.Although three DMD mode costs have increased much, can obtain very high image quality and very high resolution.

There are the following problems in existing DLP projector:

1, adopts the UHP lamp.The serviceable life of this projection lamp is short.Also only be 6000 hours serviceable life half life period of the UHP projection lamp of world-renowned Oslan, Philips.Although the life-span of dmd chip reaches 200,000 hours, the life-span of projection lamp has only 6000 hours, that is will change an expensive projection lamp less than about 2 years, and this is difficult to accept for the ordinary family user.Judging from the current situation, the raising in the life-span of UHP lamp is very limited, and wishing has bigger breakthrough unlikely.Secondly, this lamp working temperature is very high, must with at a high speed, the refrigeration of low noise blower fan, also must time-delay during switching on and shutting down, otherwise defective chip or shorten its serviceable life very easily.One chip dmd chip projector particularly, the life-span of the high-speed color runner that it is inner is also very important, because any motor rotating all has mechanical wear, serviceable life is far away from this electron-like device of DMD.So although dmd chip has the very high life-span, because of all factors such as UHP lamp and colored runners, its life-span does not far reach actual due serviceable life, can not give play to the excellent properties that its this life possesses at all, become the bottleneck that restriction projector extensively popularizes.

2, data introduction, the optical loss of chromatic color filter has 2/3 approximately, and the optical loss of polaroid has 1/2 approximately.With present 250W UHP lamp is example, need only make projection light source by 80W, and have 160W to be lost by color filter and polariscope.And this 160W power becomes the working temperature that heat energy has increased projector.And the brightness of color saturation and light restricts each other: improve brightness, color saturation reduces; Improve brightness, color saturation, certainly will increase color filter, polariscopic density again, brightness is lowered again to some extent and power consumption has increased, and it is bigger to generate heat.

In sum, existing DLP projector is because of high power, high-temperature, low UHP lamp of life-span, and excessive color filter and the polariscope of optical loss restricted popularizing of DLP projector and development, have to select for use new projection light source, new color separation mode, lower the power consumption and the thermal value of light, improve serviceable life, can with the DMD pearl connect wall and, bring out the best in each other.So

1, serviceable life and the high heating problem in order to solve projection light source just can not adopt existing UHP lamp again;

2, cancellation intercepts the color filter and the polariscope of light source, and the luminescent device of RGB three coloured light can be directly sent in selection.

Summary of the invention

The purpose of this utility model provides a kind of digital micro-mirror-laser projection, its projection light source adopts red, green, blue three look semiconductor laser diodes, the laser diode of every kind of look is formed by many, evenly distributes and is fixed on the rectangular susceptor, and rectangular susceptor and heating radiator are close to and are one; Adopt the distinctive light modulation techniques of semiconductor laser.

The technical scheme that the utility model adopted is: select the new type light source of semiconductor laser diode as DLP projector for use, this light source can independently be launched RGB three coloured light, possesses long-life, low-power consumption, low temperature rise simultaneously again, achieves many things at one stroke.

1, semiconductor laser diode is that a kind of volume is little, efficient is high, heating is low, the electron device of long service life.The life-span 5-10 of red laser diode is more than ten thousand hours at present, and cost descends rapidly; In the life-span of blue laser diode, Sony Corporation has reached 10,000 hours at the end of the nineties, surpasses the UHP lamp; Homemade green laser diode also reached 6000-1 more than ten thousand hours, and the life-span of Japan and the United States' green laser diode is higher.And semiconductor laser diode just by leaps and bounds developed in recent years, and its various performance index will further improve, and cost is more and more lower, and the life-span is more and more longer.Semiconductor laser diode and dmd chip belong to microelectronic component together, and its life-span may reach the order of magnitude suitable with DMD in nearly 1,2 year.

2, semiconductor laser diode is the luminescent device that a kind of brightness is high, color is extremely pure, and laser can be used as the standard colors of three primary colours in theory, and it is a kind ofly can independently launch the luminescent device of single color.When making projection light source, carry out separating of look without color filter with polariscope fully, can significantly reduce the loss of light, lower luminous power, reduce light-source temperature, cancellation color filter and polariscope and structure division thereof.At present, the laser diode of red, green, yellow both at home and abroad, blue various models, various power is a lot, integrated, the semiconductor laser of array is also more and more, develops very rapid.

3, laser is a kind of light source of high order focusing, and dmd chip is a kind of large scale integrated circuit LSI, and its work micro mirror minute surface size is minimum, is 0.5-0.7 English inch, is fit to very much the high focus characteristics of laser.

4, adopt the distinctive light modulation techniques of semiconductor laser: the UHP light source that projection is used be at work a kind of can not modulated light source, no matter image is bright dark, even image is when black entirely, all with constant full light output; But the maximum characteristics of semiconductor laser are modulated light sources, during work, R, G, B three beams coloured light can carry out synchronous modulation along with what, the size of brightness of the color of a certain pixel, picture, its light output=(full light+complete black)/2=(full light-the 0)/full light of 2=/2, variation with image is exported at half light, and promptly mean value swings up and down: be output as 0 when image laser when deceiving entirely; When image was maximum brightness, laser was total power output.Can lower the output of light significantly, reduce thermal value significantly, prolong the mission life of laser diode significantly, this now the UHP of DLP projector light source can't realize.Another advantage is: present DLP projection pattern, brightness of image, colourity are to realize by the angle of the micro mirror on the modulation dmd chip, frequency; But in the Laser Modulation light source, the modulation of DMD micro mirror is arranged not only, and the dual modulation of three look laser brightness is arranged again, so color saturation of image will be greatly improved, DLP projector is more difficult to manage now just obtains for this.

5, in various projectors now, the power consumption of light accounts for the overwhelming majority of whole projector, and optical texture accounts for major part.After adopting semiconductor laser diode, can reduce the power consumption of projector greatly, the volume of reduced projection machine, green, energy-conservation, the miniaturization of real realization.

The beneficial effects of the utility model are:

1, adopts semiconductor laser to replace used UHP light source, will cancel chromatic color filter and polariscope and structure division thereof, significantly reduce the loss of light, lower the power consumption of projector, reduce light-source temperature, the volume of reduced projection machine.Realize green, energy-conservationization, volume miniaturization.

2, semiconductor laser development has not only surpassed the UHP lamp its serviceable life rapidly, and might be in recent years in approaching or reach ten thousand hour serviceable life of 10-20 of dmd chip, thoroughly solves the bottleneck problem of light source of projector.

3, modulation red, green, blue three look lasing light emitters, make it synchronous with circuit signal, realize the dual regulation of circuit and light path, make variation the swinging up and down in half light output of laser output with image, lower the output power of light source significantly, reduce the thermal value of light source, the mission life that prolongs laser diode significantly, the further simultaneously color saturation that improves image.

Description of drawings:

Further specify below in conjunction with drawings and Examples.

Fig. 1 is the utility model semiconductor laser projection light source integral structure synoptic diagram;

Fig. 2 is monolithic dmd chip projection pattern photovoltaic principals figure;

Fig. 3 is three dmd chip projection pattern photovoltaic principals figure;

Fig. 4 is the photovoltaic principals figure of monolithic dmd chip projection+laser modulator mode;

Fig. 5 is the photovoltaic principals figure of three dmd chip projection+laser modulator modes.

Among Fig. 1, the 1-laser diode divides RGB three looks, 2-pedestal, 3-heating radiator, 4-laser projection light source.Among Fig. 2,4-laser projection light source, 5-DMD chip, a slice; 7-picture signal processing controller; The 8-projection lens.Among Fig. 3, the 4-LASER Light Source, the 5-DMD chip, divides red output dmd chip, green output dmd chip, blue output dmd chip, 7-picture signal processing controller by three; The 8-projection lens, the 9-refracting telescope.Among Fig. 4,4-laser projection light source, 5-DMD chip, a slice; The 6-laser modulator, it includes the red laser modulation circuit, the green laser modulation circuit, the blue laser modulation circuit, three circuit are independent separately, and required control signal, time sequential pulse are provided by the picture signal processing controller; 7-picture signal processing controller, the 8-projection lens.Among Fig. 5,4-laser projection light source, 5-DMD chip, three; The 6-laser modulator, 7-picture signal processing controller, 8-projection lens, 9-catoptron.

Specific embodiment:

1, semiconductor laser projection light source (Fig. 1): this laser projection light source includes red (R), green (G), blue (B) three look semiconductor laser diodes (1), every kind of laser diode is formed by many, evenly distribute and be fixed on the rectangular susceptor (2), pedestal (2) is close to heating radiator (3) and is one.For strengthening radiating effect, can on heating radiator, settle the low noise high-power fan.

2, monolithic dmd chip laser projection mode (Fig. 2): semiconductor laser projection light source (4) is aimed at dmd chip (5), when dmd chip (5) display image a certain, red, green, blue laser diode timesharing on the LASER Light Source (4) circulates in order and exports red (R), green (G), blue (B) three look laser, dmd chip (5) goes out laser through image process controller (7) synchro control back reflection, invests the screen video picture through camera lens (8).Because the slewing rate of three kinds of colors is exceedingly fast, and substantially exceeds the lag-effect of eye, what seen is the image frame of a width of cloth web stabilization flicker free.In this mode, RGB laser chronologically, total power output, principle is with colored runner.

3, three dmd chip laser projection modes (Fig. 3): the red, green, blue three look laser RGB on three LASER Light Source (4) are three dmd chips of directive (5) respectively, reflect three beams RGB laser from three dmd chips (5) again, wherein (R) light, (B) light is through refracting telescope (9) directive camera lens (8), and (G) the direct directive camera lens of light (8).R, G, B three coloured light are invested the screen display picture of publishing picture together after camera lens (8) converges.In this mode, the continuous always full power operation of the RGB three look laser of laser head, by the output of image process controller (7) control chart picture, the UHP light source projection pattern of roughly the same present three DMD, different is to substitute UHP light with laser.

4, monolithic dmd chip projection+laser modulator mode (Fig. 4): this mode is the modulation function that increases laser on Fig. 2 monolithic DMD mode basis.The same Fig. 2 in circuit aspect.Different is the light path aspect: image process controller (7) is not only controlled dmd chip (5), and another road control signal is delivered to laser modulator (6), interior RGB three coloured light of difference modulated laser source (4), three look laser after the modulation are mapped to dmd chip (5) by the method for timesharing order, arrive the screen video picture through camera lens (8) again.Image process controller (7) carries out synchronously to the control of circuit and light path.

5, three dmd chip projection+laser modulator modes (Fig. 5): in this mode, the same Fig. 3 in circuit aspect; The light path aspect, picture signal processing controller (7) control modulator (6), modulator (6) is modulated respectively the RGB of lasing light emitter (4).

Claims

1, a kind of digital micro-mirror one laser projection, its inner projection light source, dmd chip (5) and (8) three basic elements of character of camera lens are formed in proper order, picture signal processing controller (7) is connected with dmd chip (5), it is characterized in that semiconductor laser projection light source (4), red, green, blue three look semiconductor laser diodes (1) are installed in semiconductor laser projection light source (4), the laser diode of every kind of look is formed by many, evenly distribute and be fixed on the rectangular susceptor (2), rectangular susceptor (2) is close to heating radiator (3) and is one.

2, digital micro-mirror one laser projection according to claim 1, it is characterized in that laser modulator (6) is connected with laser projection light source (4) electric wiring, the control signal wire of picture signal processing controller (7) is connected with laser modulator (6) electric wiring.